We have a Mac Mini (intel) and somehow the login screen is set to reverse colors (white on black if you went to universal access). Once you login it switches back to normal colors. I can't find any option to enable or disable this. I've tried looking in the Prefences folder for the system and the com.apple.LoginWindow doesn't seem to have anything in it. I tried cmnd-opt-ctrl-8 (the keyboard shortcut for it) and that didn't change it. I've tried reparing permissions on the drive. I've also tried resetting NVRAM. What else could I try to fix this? thanks. I restarted again and noticed that it's actually reversed the moment the machine starts and displays the apple logo if that helps any.